The Part Price Is Not the Repair Price

A purchasing spreadsheet can compare two perfectly valid prices and still ask the wrong question. In the Lufthansa Technik latch case, the choice was not simply polymer versus titanium. According to Formnext's August 21 report, the polymer latch was unavailable as an individual spare, so a failure meant replacing the roller-shutter assembly. That changes the starting point for a maintenance business case. Here is a three-part checklist for teams comparing a replacement part with their current repair route.

1. Name both units: the failed part and the purchased replacement. Start with a service record and the actual spare-parts offering. Is the failed item sold separately, or does procurement have to buy a larger assembly? Record what gets discarded or replaced alongside the failed component. A comparison of print cost and original part price misses the problem if that original part cannot actually be bought.

2. Price a usable replacement, not a print. Lufthansa Technik designed and optimized the titanium latch; Materialise manufactured it after supplier qualification. The change required attention to elastic response, geometry and wall thickness. For your own candidate, list the design work, verification, manufacturing controls and traceability that would be needed. Treat those as questions to cost and resolve, not as benefits supplied automatically by a printer. A promising repair concept is not yet an interchangeable, usable spare.

3. Separate the repair change from the lifetime claim. The immediate change in this case is the ability to replace the latch instead of the whole roller-shutter unit. Materialise's case study also describes an expected longer service life. Those are different things to measure. Track replacement scope and repair expense first, then service history as it becomes available. Do not enter an expected lifetime improvement in a spreadsheet as though it were a measured fleet-wide failure rate.

Aviation Week reported on August 18 that the latches were already flying. The public accounts do not provide a long-term failure-rate dataset or a transferable percentage saving. This checklist therefore helps frame a comparison; it does not establish a return on investment for another component. The most useful first question may be: what do we have to replace today because the smaller spare is missing? Read EyeContact's Korean case explanation for the design and manufacturing background.